The plotline has a character display some vice, flaw, prejudice, or other negative attribute/behavior, which said character has never before this point shown any signs of suffering from, but which they then engage in solely as the setup for some sort of One Shot gag or An Aesop. (In some cases, the plot claims/suggests that they've always had this problem, even though previous episodes show otherwise.) It then vanishes totally after the end of the gag and/or plot. Sometimes this is meant to serve as Character Development, but due to the entire process being constrained to that one single episode, it's not very convincing. If the creators are more consistent about the issue, it becomes a largely Informed Flaw which drives several distinct episodes, but still is never observed in a character outside them. Shows up frequently in Very Special Episode, although rarely in the Too Smart For Strangers variant for obviousreasons...
This is distinct from writers adding enduring flaws to a Flat Character, or hypocrisy no one notices with Moral Dissonance. If the character has to try and lose the vice in the same episode, they'll find Cold Turkeys Are Everywhere.
Compare Compressed Abstinence, Long Lost Uncle Aesop, Can't Get Away With Nuthin', Characterization Marches On.
This trope is a sub-trope of Backstory of the Day.
Examples
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Anime and Manga
xxxHolic manages to give a Compressed Vice to a character who only appears in two episodes. After Watanuki manages to help convince a shy girl that her negativity is literally cursing her to fail and that she should try to be more positive, her more upbeat and outgoing twin suddenly turns into the sister from hell, psyching her out even worse than she ever did to herself until the poor girl is on her knees and paralyzed by the feelings of uselessness her sister is laying on her. Then, after Yuuko intervenes and the Aesop is learned, all is sunshine again.
Himitsu no Akko-chan, the original 1969 series, manages to literally wish a Compressed Vice to the main character, just to scare her into her personal Aesop. In episode 32, aptly named "_____", upon meeting a deaf-mute kid, Akko-chan, out of empathy and curiosity, wishes to her magic mirror to be a deaf-mute version of herself. Upon discovering that, being speechless, she can't wish anymore, and she'll be stuck that way forever, Akko-chan literally breaks apart, feeling scared and useless until the mirror, reasoning that she got her Aesop about hasty wishes and physical ailments, and she understood the true courage of her new friend (who, of course, will never be seen around for the rest of the series), lifts the wish on its own accord.
In his first appearance in the first issue of the original Ah! My Goddess manga, central character Keiichi Morisato, left behind on phone message duty by his dorm mates, is seen taking solace in a cigarette shortly before making the misdialled call that will change his life. This piece of characterisation was dropped before he had a chance to demonstrate it again, and was absent from all subsequent adaptations.
Film
In the second and third movies of the Back to the Future trilogy, Marty has a Berserk Button about being called chicken that was never mentioned in the first movie. Admittedly, nobody had called him chicken in the first movie, so at least this one's not an actual inconsistency.
There is an awesome Fan Theory that this was the effect of changing the timeline in the first movie. Just like the changes to his siblings in the new timeline, when Marty returned home, the timeline shift sort of replaced him with a different Marty that had been raised on the story of brave his father was back in high school. So the "new" Marty has a complex about proving that he can live up to that example.
Another thought is that it may be an attempt to repair the possibly Broken Aesop of the first movie - that it's always better to be assertive.
In Speed, Annie Porter (Sandra Bullock) is seen grabbing a hasty cigarette as she runs for the bus'o'peril. Despite all the stresses she undergoes, and all the relative lulls in the action, she is never seen smoking (or even expressing a desire to smoke) after that opening shot.
There's that one scene in The Night Porter where Lucia Atherton (Charlotte Rampling) is seen smoking a pipe. Yes, she smokes, but not a pipe. There is no foreshadowing, and neither she nor Max Aldorfer (Dirk Bogarde) mention it during or after the scene. Indeed, that's the only time a pipe appears on screen, so there isn't even any indication of where she might have got it. It's probably intended as another sign of her descent into strangeness and depravity, but has shades of a Big Lipped Alligator Moment.
Literature
The Adventures of Tom Sawyer: on the island, having run away from home, Tom Sawyer and Joe Harper both learn to smoke. They get sick at first, but get over it with practice. Having returned home, they show off their habit to their classmates once, and that's the last time it's mentioned. No cravings, no having to sneak off with stolen tobacco, not even classmates telling tales about them. It is true that addiction wasn't really understood at that time - even long-term smoker Huckleberry Finn experiences little more than irritation when his adoptive guardians won't allow him to smoke.
The kind of tobacco Tom and Huck would have had didn't have the high nicotine content of modern tobacco, and was not as addictive; moreover, not everyone who smokes becomes addicted to nicotine. Back when people did not realize that smoking was unhealthy, lots of people were occasional, or on-and-off smokers, and many people quit when money was tight, then resumed when they could afford it again. Nowadays, pretty much only those addicted to nicotine will smoke.
Tobacco varieties might well have been changed over the years, and certainly, people react in different ways to nicotine, with some being effectively immune to nicotine addiction. Tom, Joe and Huck could have been three of the lucky ones. However, historical accounts are clear. The first conquistadors to take up smoking were ordered to stop by Pisarro, risking punishments up to and including summary execution when they told him they could not. They could also have been excommunicated - the first smokers to return to Spain were locked up by the Inquisition. When trade in tobacco started, it was traded weight-for-weight with silver. Rich men bankrupted themselves servicing their addictions, and the poor starved themselves and their families to service theirs. In Japan, the shoguns instituted draconian laws against tobacco, and people suffered imprisonment and confiscation of their property because they were unable to stop. Make no mistake, tobacco was highly addictive even back then.
Live Action TV
An episode of The Golden Girls revealed that Rose has been addicted to prescription strength pain-killers for decades. It also strongly implied that her perpetually sweet disposition is at least partially the result of taking these drugs. Despite the coda of the episode having her statement that she'll be fighting this addiction the rest of her life (albeit filled with hope that she can pull it off), it's never truly referred to again.
Similar events happened to Dorothy, who had two relapses of former addictions she had beaten (smoking and gambling.) Aside from the episodes in question, they were never mentioned again.
Joey from Blossom hates a gay guy in one episode, revealing a prejudice that hadn't previously been mentioned in the show. Later in that episode, his black sister-in-law tells him a story about how she faced discrimination as a child, causing him to renounce his prejudice as quickly as he developed it.
Wasn't it more a resistance to a friend coming out to him by revealing that he had feelings for him (Joey gets note from "Leslie," doesn't know which Leslie it is, and then his friend Les says that it was from him)? In that case, Joey being angry for a awhile makes sense since Les knew he was straight. I don't remember it being "Joey hates the gays."
A particularly offensive episode of Lizzie McGuire featured her pal Miranda becoming anorexic and then getting over it within the course of a week.
It also had Gordo becoming addicted to Deeandeeaproximine...and then getting over it within the course of a week.
As does an episode of The Facts of Life, which had Sue Ann getting, and recovering from, anorexia.
D.J. had anorexia for fifteen minutes on Full House. They literally reduced it to skipping a couple of meals before being saved by Aunt Becky.
Likewise, an episode of Diff'rent Strokes has Kimberly getting bulimia.
The most common excuse as to why Tommy turned up late to the battles was that he had "forgotten his morpher". The real reason was that in the original Super SentaiZyuranger, his counterpart had to turn up at the last minute because he was living on borrowed time and his place of residence delayed the inevitable.
Those are fan based rumors. Tommy never in fact forgot his Morpher ever. The reason he was always late for battle were because he was otherwise indisposed through various reasons (captured by mooks, finishing his Halloween costume, knocked out the Monster of the Week, working on a talent show, taking kids trick or treating) throughout the arc between his initial joining and his powers weakening and once they weakened he was ordered to stay out of battle at all costs unless absolutely needed as a trump card. That said Tommy was always slightly forgetful but it only really was a problem for him in that one ep.
There was a later episode when someone (I believe it was Tanya) said "Tommy's always late".
Several episodes give this a form of justification in which the character flaw is the result of an evil spell cast by the villains. Often the affected characters have to overcome the flaw as if it were natural anyway, at least for long enough to defeat the Monster of the Week and break the spell.
An episode of Spin City had Carter trying to quit smoking, despite having never been seen touching tobacco before (or since). This episode also featured Paul getting addicted to nicotine gum.
Ned's Declassified School Survival Guide, "Guide to School Records"- Ned is a basically well-intentioned, "smart butlazy" kid in the rest of the series, but this episode shows him pulling all sorts of deliberately mean pranks on his way to accruing the biggest permanent record in the school. Flashbacks are used, which (unusually for the show) were filmed just for this episode, not taken from earlier ones, further playing up the trope.
If a young attractive female character is introduced to a series and some fuss is made over the "fact" that she smokes, then it is near certain that that will be the last time that she is seen with tobacco, or that it will even be mentioned. Examples-
Marissa Taylor in the defunct Australian comedy/drama Always Greener. Admittedly this last one could be regarded as just a set-up for a joke about an exploding cow, but credibility was stretched in a later episode where she stood right next to another character who was smoking, without batting an eyelid.
A particularly extreme example appeared on Rome, with the reveal that Octavian was deeply in love with (as in, wanted to have sex with) his own sister. Not only had nothing even hinting about this ever come up before, but the episode itself has zero hints about it until Servilia lets his sister know— which actually justifies it, as he was clearly very good at keeping it secret.
In Friends, in the first episode where we see Chandler smoke and the others disapprove of it, he delivers a speech about how he accepts their flaws and only expects them to accept his in return. Said flaws include Joey cracking his knuckles, Monica snorting when she laughs and Phoebe chewing her hair — none of them appeared before, or after this episode. The one about Ross overpronouncing every word applies, though.
A Friends episode that shows less respect for continuity comes in the Season Five New Year's episode where Rachel suddenly turns into a gossip who can't shut up about her coworkers' dirty laundry. The whole thing turns out to be a plot device to launch us into a Cold Turkeys Are Everywhere plot as Rachel resolves to stop gossiping, and then immediately discovers the unkeepable secret that Chandler and Monica are doin' it.
Aesops about snoring tend to suffer from this, as characters spontaneously develop the habit and then no reference is made to this afterwards. Examples include Joey from Friends (Chandler can suddenly hear him through the wall after living with him for five years with no problem), Charles Winchester from M*A*S*H (his tentmates don't notice until it's made a plot point), and Homer Simpson from The Simpsons (he suddenly starts snoring loudly after years of sleeping with his wife).
In the case of Charles, he was only snoring because of allergies acting up, leaving him unable to breathe normally.
Done in Red Dwarf where the crew is forced through the air ducts of Starbug. Lister is revealed to have claustrophobia. Subverted somewhat when Cat lists a number of examples where he's been trapped in a confined space and didn't freak out, naturally this didn't help Lister.
Worf was the victim of this in the episode where a genderless alien species showed up, and he was saying things like it being "unnatural" and the like. This particular prejudice wasn't seen previously in all the cases where he met aliens who didn't have a traditional gender setup, and never appeared again.
There was a late episode, where there was a homicidal shapeshifter on the station, and the other main characters responded by revealing their prejudice against shapeshifters, which had never been hinted at before, even after years of fighting a Dominion run by shapeshifters.
Similar example in Star Trek: Voyager, in an episode where the Doctor found out that Janeway had tampered with his memories to prevent him going "insane" over an old triage case, and Janeway and the entire crew suddenly seemed to develop an anti-hologram prejudice which then immediately vanished again next episode.
Tommy from 3rd Rock is revealed in one episode to have been hiding sandwich bags full of spices to indulge his secret cooking hobby in secret ("It's marijuana, I smoke it with friends I swear!"). This is never mentioned again.
M*A*S*H: the plot of episode "C*A*V*E" is based on Hawkeye's suffering from crippling claustrophobia, which had never been mentioned before and was never referred to again.
Likewise Colonel Foster in the UFO episode "Sub-Smash".
The Professionals. In "Klansmen" Bodie displays overt racist behaviour never shown previously by his character, and due to the events of the episode (in which his life is saved by a black doctor) we never see it again. Actor Lewis Collins was not pleased.
Subverted in the Malcolm in the Middle episode where Francis turns out to have been in AA despite never having been shown getting drunk in previous episodes. The other characters find out that he had all the signs of alcoholism except for drinking.
An episode of How I Met Your Mother deals with the annoying habits of the group. The bad habits of Ted, Marshall, Barney and Robin are noticeable prior to the episode (although Robin's misuse of the word 'literally' was subtle before it was pointed out), and they still have them in later episodes. Lily's habit of chewing too loudly is a true Compressed Vice, as it appeared only for that episode.
Justified in later episodes featuring the characters throwing "interventions" to stop each other's similar minor annoying habits: though Barney's use of magic was featured in previous episodes, other character's habits had just never been incorporated into Future Ted's unreliable narration.
Another episode shows all five characters being habitual cigarette smokers. Previously, Barney and Robin had been seen smoking cigars, and it was hinted that Robin smoked cigarettes, but this episode portrayed Robin as practically a chimney. The other characters don't smoke nearly as often, but obviously way more than has ever been let on before. Ted's children are stunned at the news.
In the Lent episode of Father Ted, while Ted's smoking and Jack's drinking have been previously established, Father Dougal's addiction to roller blading only exists in this episode. However, as the whole series runs on Negative Continuity and Rule of Funny, this scarcely seems to matter.
An odd example from 24 in that Jack's heroin addiction from season three is dealt with over multiple episodes, but since those episodes take place over one day, he really should be suffering for far more than the first few hours. But then, many examples can be taken from the show where people get over things (emotionally or physically) way faster than they should realistically be able to - Tony having major surgery after being shot but getting straight back to work just a couple of hours later, for example.
The heroin thing was actually dealt with by Jack being given some vague other drug that would mask the withdrawal symptoms for about a day, i.e. the rest of the season, after the writers realized it was becoming more trouble than it was worth.
Even though the main characters of Seinfeld are already Unsympathetic Comedy Protagonists in their own ways, Elaine seemed particularly pretentious and angry in the episode "The Dinner Party." She was pretentious in that she went on and on about how she wanted to be the perfect dinner party guest, and angry in that she seemed very eager to beat up George. This was the only episode where these traits appeared.
On one almost-Very Special Episode of WKRP in Cincinnati, Herb Tarlek had a problem with alcohol which had not been mentioned previously and which he overcame by the end of the episode.
Actually it had been subject to foreshadowing in an episode a couple of weeks before, where it was mentioned that his three-martini lunches were causing him to forget things he'd said and done. And he mentioned still having his drinking problem in a couple of other episodes.
Eri in Tensou Sentai Goseiger is revealed to be very messy and lazy in Epic 9, causing her to clash with Moune as part of their focus episode. These bad habits are never mentioned before or since.
For the Glee episode "The Power of Madonna", the boys are suddenly shown mis-treating the girls in various ways to a highly exaggerated extent, in order to setup the feminist message of the episode. This is incredibly jarring because, for instance, Artie is shown being rude and misogynistic to Tina, even though he has never displayed this attitude before.
Don't forget Will's drinking, which goes from the mature and normal occasional beer to, apparently, a full on drinking problem.
Stumpy's gambling addiction isn't mentioned at all in season one of Carnivāle, even though by the beginning of the second series he has the debt collectors after him and a $400 debt (in old-timey Great Depression-era money).
Adjusted for inflation, $400 in 1934 would be worth about $6443.73 in 2010's dollars.
In one Very Special Episode of Boy Meets World, Shawn gets drunk for the first time and then has a drinking problem for about a week before his friends convince him to give up drinking altogether. However, he does turn back to alcohol in an episode two seasons later after he learns some devastating news, though only for that episode.
In one episode of Alice, Alice, Flo, and Vera all try to help each other kick their previously-unmentioned vices: Alice eats too many sweets, Flo drinks too much coffee, and Vera very uncharacteristically smokes. None of these vices, or the fact that at the end of the episode, they had all switched vices, was ever mentioned again.
In the Community episode "Regional Holiday Music", Glee Club instructor Mr. Rad insists that Britta play the part of a mute tree, and when we finally see Britta sing her awkward song, we understand why - she's terrible. Thing is, we've heard Britta sing in other episodes. We hear Britta sing in the very next scene. She's not terrible at all unless the plot requires it.
The The Mary Tyler Moore Show episode "Mary's Insomnia" has Mary turning to sleeping pills to get over a new-found case of insomnia, becoming dependent on them, and getting over her addiction, all within one 25-minute episode.
Newspaper Comics
In an early Garfield strips, Garfield is shown smoking Jon's pipe. Which doesn't stop him from thinking a few years later that he could need yet another vice, "like smoking". In fact, neither did Jon smoke a pipe in any other strip, AFAIK.
Inverted and possibly subverted in the webcomic Narbonic, where Dave's chain-smoking habit is established early on and continually referenced. However, after Dave goes back in time and alters the event that causes him to start smoking, he is surprised to find that he has no addiction at all... and the other characters assure him he never did, smoking was never relevant to any of their adventures, and they are confused when he brings it up. The author even devotes a filler comic to two fans explaining how the previous plots where his habit was a key point make sense without it.
Subverted in Unshelved. A storyline deals with Colleen quitting smoking — when there was no indication of her being a smoker before, and even the other characters are surprised to hear about it. At the end of the storyline, it turns out this is because she quit decades ago, when she was still a teenager — she made it sound current as an excuse for being rude to a patron at the library.
Western Animation
The Garfield and Friends episode "Sales Resistance" revolves around Garfield's obsession with buying useless stuff off the Shopping Channel - an obsession which he has only in this episode.
Hey Arnold!! "Rhonda's Glasses" has Rhonda suddenly turning out to be short-sighted and needing glasses, despite not having had any signs of difficulty before, or after (though when being forced to try on glasses, her mother says her eyes "aren't ready" for contact lenses, suggesting that she was able to acquire some by the time the next episode took place).
A much later episode mentions her having contacts - about four seasons later.
Danny Phantom does this frequently, with Danny himself being the usual suspect.
Tucker had one of these in "Doctor's Disorders." He had a horrible fear of hospitals that we'd never seen or heard of until he had to wear a paper bag over his head just to walk past the nurse's office.
The Simpsons has been doing this just about every week for the past decade. Though some have come to receive Continuity Nods every now and then. One memorable aversion came with Marge's gambling problem, which was expected to become forgotten by the next episode like most but has been managed to be referenced countless times. In some cases, outside of the show.
One of the most glaring examples of this in the episode "Fear of Flying", which suddenly introduced Marge's titular phobia and linked it to several incidents in her childhood despite an earlier episode ("Mr. Lisa Goes to Washington") having had the family go on a flight with no incident whatsoever.
Which may explain why the scenes of them in the plane have been cut from later broadcasts (at least in Australia).
At the end of the episode in which Lisa purposely starves herself after the kids in school make fun of her butt being fat, Lisa tells Homer that, even though Nelson beat up the girls who made fun of her and that she finally ate something after days of starvation, she (like many girls and women in real life, sadly) is never going to be happy with her body image and will probably relapse again later in life. Granted, this is never mentioned again, but the thought is very chilling in case the day comes that the writers do bring it back.
Also a Running Gag in the form of Homer's "life-long ambition" changing every time it comes up, and Marge pointing this out.
Homer is seen smoking cigars once or twice, usually for the pose factor. And Ned Flanders shows off a pipe - once - to provide Homer with yet another conversational opener to rebuff.
In "Mountain of Madness" Homer and Mr. Burns are trapped inside a cabin that's been buried in snow by several avalanches; as cabin fever sets in, they become delusional and paranoid, until eventually they try to kill each other. While that can happen to two people who are stuck together under harsh conditions, Burns and Homer were only in that cabin for a few hours before they start planning to murder.
One episode had Bart's hellion tendencies stemming from Homer's inability to punish Bart for his bad behavior. The same Homer who routinely strangles him for misbehaving.
Family Guy also has a strong habit of doing this. For example, one episode revealed that Peter retains a dislike of handicapped people on the loose reason that they're just "not cool." Completely disregarding the fact one of his best friends (sort of) is handicapped.
Eh, no. In Joe's very appearance Peter displays some shock and prejudice when it turned out that he was in a wheelchair. Some of this ended up being jealousy over how cool Joe was, but the prejudice was there. He ignored it because Joe became his friend but, fact is, many Real Life prejudiced people will make exceptions for close friends and family. It could also be that Peter thought that, though Joe was so much braver and cooler than him, he's handicapped, so that's okay. His problem was that he didn't like that people thought being handicapped was "okay"; which, again, Joe balances out just by being Joe.
Of course, the episode in question happened several seasons after Peter first met Joe, making it fall into this trope anyway. It's doubtful the writers actually remembered he disliked him at first, too.
In "The Cleveland-Loretta Quagmire", Quagmire seems to feel unusually reticent and guilty about sleeping with Cleveland's wife, claiming that because it's the wife of a close friend, he'd be crossing a line. This seems strange considering how often he's tried to seduce Lois.
Quagmire has a serious crush on Lois to the point of stalking her— unlike Loretta, who is considerably less attractive. Also, Quagmire only felt guilty after having sex with Loretta.
And let's not forget Quagmire accusing Brian of dating bimbos and tricking them into thinking he's a deep, intellectual guy. Of course, Quagmire is aware of this and points out that, "Yeah, I date women for their bodies, but at least I'm honest about it."
Quagmire's said resentment towards Brian and inability to restrain his anger or disgust for nearly everything he says and does also was established completely in this episode, with him being far more friendly and passive towards Brian and any genuinely obnoxious habits he had beforehand. Played with however, since this trait has reappeared several times afterwards (depending on Rule of Funny at least) to the point Brian has more naturally developed a mutual resentment towards him.
One of the most horrid cases takes place in the later seasons of Static Shock. In one of several Very Special Episodes, Adam Evans (aka Rubber-Band Man) out of nowhere suddenly has dyslexia, and from what we're told, has had it since he was a child. And not just a mild case for that matter, more like sees a stop sign written in Arabic type. The episode ends with Static and Adam giving a brief speech about dyslexia a la And Knowing Is Half the Battle and Adam's reading disorder is never brought up again. This is particularly egregious, since Adam was previously shown reading. In fact, one episode had him mention aloud (With nobody around for him to be trying to lie to) "I still have all this fan-mail to read" as he picks up, opens, and begins to read said mail (Even more of a retcon since when his dyslexia appears in this episode, the fact that none of his fan-mail was open becomes a clue that he could not read).
One episode of Futurama gave Bender an obsession with being remembered - something he'd never even hinted that he might have had before. It never came up again.
That one's more like a once off flanderisation. Bender always wants to be the centre of attention, they just kicked it up ten notches for that episode.
In another episode, four of Bender's ten most frequently used words were words he only used in that episode. (Obviously, a parody.)
It was also shown that Bender cannot get up if he is knocked onto his back. (All the other times he was slightly on his side.) By the end of the episode, he learns how to overcome his erectile dysfunction.
Bender's irrational hatred of Nibbler lasts exactly one episode.
Although it could be argued that everyone else's irrational obsession with Nibbler at Bender's expense lasted exactly one episode.
Haven't seen enough episodes to be sure, but an episode of The New Woody Woodpecker Show, "Automatic Woody", has Woody dreaming about eating "Butterscotch Finger Pies", and then waking up and finding tons of empty wrappers in the various places he's stashed some for midnight snacking, and then going through lots of trouble to buy some more.
Unfortunately, most of Kim Possible's Character Development is about getting a character flaw of the week that must be conquered by the end of the episode. The best example of this trope would be in So the Drama, where Kim chooses the Romantic False Lead instead of Ron. She does that, in part, because Bonnie told Kim that dating Ron would be much below her standard, which Kim doesn't object to, which is weird because not only did Kim refuse to believe in those rules when Ron mentioned them in one episode, she also spent the before episode completely in love with Ron.
Brenda's slovenliness was the revealed in the same episode of Teamo Supremo as it was cured. (At least her desire to be a famous pop singer cropped up in more than one episode.)
The Producing Parker episode "The Skinny on Parker" had Parker developing anorexia and immediately getting over it after being force-fed a sandwich.
One episode of The Fairly OddParents revealed that Trixie Tang was actually a Tomboy who liked "boy things". like a lot of things in this show brought up in just one episode, it was never mentioned again.
And in another episode, she went absolutely insane when Timmy wished they were the last two people on Earth, because there was nobody else left to pay attention to tell her she's pretty. This one at least is a vice much in line with her standard characterization... although one never referenced before or since, making it still count.
Then again, you can argue BECAUSE Trixie has the hundreds of boys telling her she's pretty (like before) she wouldn't freak out again. Remember, she was fine until she was utterly alone.
An episode of King of the Hill revolves around Hank's obsession with his guitar. Peggy claims that he pays more attention to the guitar than to her despite the fact that it's the only episode in which the guitar appears.
It was eventually replaced with a similar vice: him treating the family dog Ladybird extremely well, sometimes better than he treats Bobby or Peggy. This one, however, stayed through the entire series.
In TotalDramaAction, Trent develops an obsession for Gwen after Duncan steals her away from him.
Duncan was the one who pranked Trent, and made him lose control.
In one episode of Adventure Time, Finn discovers that he has a fear of the ocean. Only the ocean. In an earlier episode, he is seen diving headfirst into the ocean without any problem. A Hand Wave tries to explain that he thought it was a lake.
An episode of Jimmy Two-Shoes had Beezy have a severe cell phone addiction which is never mentioned before or after. He never gets over it, in fact his addiction saves everyone.
In one episode of Chip N Dale Rescue Rangers, Dale has the same reaction to chocolate that Monty usually has to cheese. It never really comes up before or after that mission.
In one episode of Slacker Cats Buckley becomes a gambling addict and there's no notion before that he has that sort of characteristic and it never happens again.
An episode of American Dad reveals that Francine has a hatred of left-handed people. This is because she was originally left-handed as a child, but a nun she was raised by was convinced that lefties were evil and disciplined her into using her right. At the end of the episode when Steve and Hayley get her to accept the fact she's left-handed she tries to get used to being a lefty again and handles tasks like you would expect a right-handed person doing tasks with their left would do, from writing on the shopping list illegibly to slitting Steve's throat with a butter knife (he got better, of course).
